Bluetooth: Expose Secure Simple Pairing debug mode setting in debugfs

The value of the ssp_debug_mode should be accessible via debugfs to be
able to determine if a BR/EDR controller generates debugs keys or not.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 22 insertions, 1 deletions

diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c
index ead89a5ad9ce..51a424cfa94a 100644
--- a/net/bluetooth/hci_debugfs.c
+++ b/net/bluetooth/hci_debugfs.c
@@ -354,6 +354,24 @@ static int voice_setting_get(void *data, u64 *val)
 DEFINE_SIMPLE_ATTRIBUTE(voice_setting_fops, voice_setting_get,
                         NULL, "0x%4.4llx\n");
 
+static ssize_t ssp_debug_mode_read(struct file *file, char __user *user_buf,
+                                   size_t count, loff_t *ppos)
+{
+        struct hci_dev *hdev = file->private_data;
+        char buf[3];
+
+        buf[0] = hdev->ssp_debug_mode ? 'Y': 'N';
+        buf[1] = '\n';
+        buf[2] = '\0';
+        return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static const struct file_operations ssp_debug_mode_fops = {
+        .open           = simple_open,
+        .read           = ssp_debug_mode_read,
+        .llseek         = default_llseek,
+};
+
 static int auto_accept_delay_set(void *data, u64 val)
 {
         struct hci_dev *hdev = data;
@@ -474,9 +492,12 @@ void hci_debugfs_create_bredr(struct hci_dev *hdev)
         debugfs_create_file("voice_setting", 0444, hdev->debugfs, hdev,
                             &voice_setting_fops);
 
-        if (lmp_ssp_capable(hdev))
+        if (lmp_ssp_capable(hdev)) {
+                debugfs_create_file("ssp_debug_mode", 0444, hdev->debugfs,
+                                    hdev, &ssp_debug_mode_fops);
                 debugfs_create_file("auto_accept_delay", 0644, hdev->debugfs,
                                     hdev, &auto_accept_delay_fops);
+        }
 
         if (lmp_sniff_capable(hdev)) {
                 debugfs_create_file("idle_timeout", 0644, hdev->debugfs,